R1NGA said:

Is it definitely exhaust fumage? There's only one joint at the front of the system and if leaking enough to have the effect you describe, it would sound dreadful. However, were the engine breather to have come lose, you'd also smell 'fumes' and feel the effects, but the source is different. Make sure the breather on the top of the cam cover is secure and fed correctly into the airbox, as leaks will make big smells in the car with the blowers on.

The heater fan takes air from the back of the bonnet/bottom of windscreen and any leaks will manifest themselves badly in traffic with the blowers on. I had the same on mine when I tried to be clever with my breather management during supercharger fitting. I though vent to atmosphere would be fine, but I was wrong....!

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koalar said:

Put your hand over the exhaust pipe at the back

Does pressure build up

Yes, great no big leaks

No, trace where its blowing from

while you do this can someone at the font hear it blowing at the front

No, great the manifold, cat, and exhaust are work as they should

Yes trace the source of the blowing

There are other sources of burning in the cabin

Breather hose (common)
Oil dripping onto the exhaust (common)

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boocc4 said:

Thanks will gve those a try

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